99942 Apophis (2004 MN4)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.1911663196 ± 2.00e+00
Semi-major axis (a)0.9223804710 AU ± 3.00e+00
Inclination (i)3.34095673° ± 4.00e+00
Long. of Asc. Node (Ω)203.89962943° ± 5.00e+00
Arg. of Perihelion (ω)126.67282559° ± 6.00e+00
Mean Anomaly (M)312.80548085° ± 2.46e-06
Mean Motion (n)1.1126206784°/day ± 5.43e+00
Perihelion dist (q)0.74605239 AU ± 3.05e+00
Aphelion dist (Q)1.09870855 AU ± 4.02e+00
Orbital Period0.88586012 yr ± 4.32e+00
NGA Modelr2
A1-3.03172826e-03 AU/d²
A2-2.37461812e-06 AU/d²
Physical Parameters
H (abs. magnitude)19.00
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-29
RMS Residual0.213″
Uncertainty0
Orbit TypeAten
MOID0.000007 AU
Observations Used8720
Oppositions2
Arc Total2004-2021
First Observation Used2004-03-15
Last Observation Used2021-05-20
Observations (10797)
Date Type RA Dec Mag Band Observatory
2021-03-08 19:33:24 C 09 14 46.77 -05 24 44.1 V A84
2021-03-08 19:35:14 C 09 14 46.42 -05 24 40.4 V A84
2021-03-08 19:37:04 C 09 14 46.07 -05 24 36.8 V A84
2021-03-08 19:38:53 C 09 14 45.71 -05 24 33.1 V A84
2021-03-08 19:40:43 C 09 14 45.37 -05 24 29.5 V A84
2021-03-08 19:42:33 C 09 14 45.02 -05 24 25.7 V A84
2021-03-08 19:44:23 C 09 14 44.67 -05 24 22.0 V A84
2021-03-08 19:46:12 C 09 14 44.33 -05 24 18.3 V A84
2021-03-08 19:48:02 C 09 14 43.97 -05 24 14.7 V A84
2021-03-08 19:54:19 C 09 14 42.77 -05 24 02.0 V A84
2021-03-08 19:54:27 C 09 14 43.57 -05 24 14.0 V C43
2021-03-08 19:55:54 C 09 14 43.56 -05 24 09.9 V K74
2021-03-08 19:56:08 C 09 14 42.44 -05 23 58.7 V A84
2021-03-08 19:58:50 C 09 14 41.90 -05 23 52.8 V A84
2021-03-08 19:58:56 C 09 14 43.00 -05 24 03.6 V K74
2021-03-08 20:00:39 C 09 14 41.55 -05 23 49.0 V A84
2021-03-08 20:00:42 C 09 14 42.46 -05 24 00.9 V G34
2021-03-08 20:02:00 C 09 14 42.42 -05 23 57.5 V K74
2021-03-08 20:02:28 C 09 14 41.20 -05 23 45.4 V A84
2021-03-08 20:04:18 C 09 14 40.85 -05 23 41.6 V A84
2021-03-08 20:05:03 C 09 14 41.85 -05 23 51.4 V K74
2021-03-08 20:05:25 C 09 14 41.60 -05 23 51.6 V G34
2021-03-08 20:06:07 C 09 14 40.52 -05 23 38.0 V A84
2021-03-08 20:07:57 C 09 14 40.14 -05 23 34.2 V A84
2021-03-08 20:09:47 C 09 14 39.80 -05 23 30.5 V A84
2021-03-08 20:10:07 C 09 14 40.70 -05 23 41.8 V G34
2021-03-08 20:11:36 C 09 14 39.46 -05 23 26.9 V A84
2021-03-08 20:13:13 C 09 14 40.07 -05 23 36.1 V C43
2021-03-08 20:13:26 C 09 14 39.11 -05 23 23.3 V A84
2021-03-08 20:14:49 C 09 14 39.85 -05 23 30.6 V G34
2021-03-08 20:19:31 C 09 14 38.94 -05 23 23.2 V G34
2021-03-08 20:24:14 C 09 14 38.05 -05 23 13.5 V G34
2021-03-08 21:31:35 C 09 14 24.84 -05 20 52.6 V L54
2021-03-08 21:48:53 C 09 14 21.84 -05 20 20.8 q 056
2021-03-08 21:53:34 C 09 14 20.94 -05 20 11.2 q 056
2021-03-08 21:58:15 C 09 14 20.07 -05 20 01.9 q 056
2021-03-08 22:02:57 C 09 14 19.18 -05 19 52.1 q 056
2021-03-08 22:04:04 C 09 14 20.20 -05 19 51.9 V Z80
2021-03-08 22:07:38 C 09 14 18.32 -05 19 42.7 q 056
2021-03-08 22:09:04 C 09 14 19.24 -05 19 42.0 V Z80
2021-03-08 22:12:19 C 09 14 17.43 -05 19 33.4 q 056
2021-03-08 22:14:03 C 09 14 18.30 -05 19 31.7 V Z80
2021-03-08 23:32:04 C 09 14 02.38 -05 16 47.9 V L54
2021-03-09 02:35:43 C 09 13 34.16 -05 10 28.0 V W50
2021-03-09 02:37:11 C 09 13 33.89 -05 10 25.0 V W50
2021-03-09 02:38:57 C 09 13 33.54 -05 10 21.5 V W50
2021-03-09 02:40:24 C 09 13 33.26 -05 10 18.4 V W50
2021-03-09 02:41:53 C 09 13 33.00 -05 10 15.5 V W50
2021-03-09 02:44:18 C 09 13 32.55 -05 10 10.7 V W50
2021-03-09 02:45:55 C 09 13 32.22 -05 10 07.4 V W50
Radar Observations (50)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2005-01-27 23:31:00 -100849.1434 0.25 Hz 2380 -1 -1
2005-01-29 00:00:00 192028507.13 4 us 2380 -1 -1
2005-01-29 00:00:00 -102512.9059 0.25 Hz 2380 -1 -1
2005-01-30 00:18:00 195808170.79 4.5 us 2380 -1 -1
2005-01-30 00:18:00 -103799.8178 0.15 Hz 2380 -1 -1
2005-08-07 17:07:00 8186.8 0.2 Hz 2380 -1 -1
2006-05-06 12:49:00 -118256.8 0.1 Hz 2380 -1 -1
2012-12-21 11:10:00 57992.443 0.25 Hz 8560 -14 -14
2012-12-22 11:00:00 102682986.05 0.25 us 8560 -14 -14
2012-12-22 11:00:00 57880.25 0.1 Hz 8560 -14 -14
2013-01-03 09:20:00 97449107.61 0.25 us 8560 -14 -14
2013-01-03 09:20:00 36629.285 0.1 Hz 8560 -14 -14
2013-01-03 10:00:00 97439308.71 3 us 8560 -14 -14
2013-01-03 10:50:00 97428425.46 0.25 us 8560 -14 -14
2013-01-05 08:40:00 30404.009 0.2 Hz 8560 -14 -14
2013-01-05 10:40:00 96911591.52 0.25 us 8560 -14 -14
2013-01-05 10:40:00 20031.16 0.1 Hz 8560 -14 -14
2013-01-05 10:50:00 96910218.03 3 us 8560 -14 -14
2013-01-06 08:20:00 26660.815 0.1 Hz 8560 -14 -14
2013-01-06 09:30:00 20775.144 0.1 Hz 8560 -14 -14
2013-01-08 08:10:00 15496.441 0.1 Hz 8560 -14 -14
2013-01-09 08:00:00 96451449.73 0.2 us 8560 -14 -14
2013-01-09 08:00:00 9670.119 0.1 Hz 8560 -14 -14
2013-01-09 09:20:00 2690.401 0.1 Hz 8560 -14 -14
2013-01-10 08:00:00 96472652.72 0.2 us 8560 -14 -14
2013-01-10 08:00:00 2590.857 0.1 Hz 8560 -14 -14
2013-01-10 09:40:00 96473924.8 0.2 us 8560 -14 -14
2013-01-11 07:20:00 -1589.599 0.2 Hz 8560 -14 -14
2013-01-14 08:10:00 97258343.56 0.2 us 8560 -14 -14
2013-01-14 08:10:00 -30561.776 0.1 Hz 8560 -14 -14
2013-01-14 09:50:00 97283037.17 0.2 us 8560 -14 -14
2013-01-15 06:30:00 -30666.291 0.1 Hz 8560 -14 -14
2013-01-16 06:30:00 98086754 1 us 8560 -14 -14
2013-01-16 06:30:00 -39582.277 0.2 Hz 8560 -14 -14
2013-01-16 07:50:00 -46641.384 0.1 Hz 8560 -14 -14
2013-01-17 06:20:00 -47875.142 0.1 Hz 8560 -14 -14
2013-02-18 00:56:00 -76760.475 0.2 Hz 2380 -1 -1
2013-02-18 01:37:00 157906444.15 0.25 us 2380 -1 -1
2013-02-18 01:37:00 -78041.365 0.2 Hz 2380 -1 -1
2013-02-19 01:08:00 -78105.657 0.2 Hz 2380 -1 -1
2013-02-20 00:38:00 -78070.341 0.2 Hz 2380 -1 -1
2013-02-20 01:26:00 163578875.87 0.25 us 2380 -1 -1
2013-02-20 01:26:00 -79560.965 0.2 Hz 2380 -1 -1
2013-02-21 01:04:00 -79697.13 0.2 Hz 2380 -1 -1
2013-03-15 23:59:00 235220855.07 2 us 2380 -1 -1
2013-03-15 23:59:00 -80977.5254 0.238 Hz 2380 -1 -1
2021-03-03 06:40:00 29329.8 0.4 Hz 8560 -14 -14
2021-03-05 07:00:00 112426746.52 1 us 8560 -14 -14
2021-03-08 02:50:00 112625015.08 1 us 8560 -14 -14
2021-03-11 08:20:00 113796393.86 1 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)